Which of the following expresses the possible number of positive real solutions for the polynomial
equation shown below?
5x3 + x2 + 7x - 28= 0

Suppose a man is heterozygous for heterochromia, an autosomal dominant disorder which causes two different‑colored eyes in an individual, produced 25‑offspring with his normal‑eyed wife. of their children, 15 were heterochromatic and 10 were‑normal. calculate the chi‑square value for this observation.

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Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)